Adjustable tool-post.



No. 852,246. PATENTED APR. 30, 1907.

J. W. SWIFT.

ADJUSTABLE TOOL PDST.

APFLIOATION HLBD MAR. s, 190s.

*Mllllll JOI-IN W. SWIFT, OF BERKELEY, CALIFORNIA.

ADJUSTABLE TOOL-POST.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed March 8, 1906. Serial No. 304,895.

To all, whom, t may concern:

Be it known that I, J onN W. SWIFT, a citizen of the United States,residing at Berkeley, in the county of Alameda and State of California,have invented new and useful Improvements in Adjustable Tool-Posts, ofwhich the following is a specification.

My invention relates to tool-posts, such as are employed in conjunctionwith lathes and for like purposes.

It consists in the combination of parts, and in details of constructionwhich will be more fully explained by reference to the accompanyingdrawings, in which- Figure l is a plan view of the tool-post. Fig. 2 isan end view partially in section. Fig. 3 .is a perspective of a member.

I have here shown a sufficient portion of the tool-rest A to illustratemy invention.

2 is a slide or collar movable in the slot or channel 3 of thetool-rest` This collar has a hole made through it of larger diameterthan that of the upper part of the toolpost 4, and the lower surface iscounterbored upon the curvature of a globe so as to receive the en--larged and similarly curved head 5 at the.

bottoni of the tool-post which may thus serve to lock the collar withinthe flanges of the channel 3 of the tool-rest. I have here shown theportion of the tool-post just above the collar as being slightly reducedin size so as to leave plenty of space for the post to be turned tostand at different angles with relation to the tool-rest, and stillallow the upper l surface of the collar to engage the flanges of therest when the parts are secured in place.

6 is a collar having a hole made through it of larger diameter 'thanthat of the tool-post e which passes through the hole and extendsupwardly from the collar. 'l he lower surface of the collar is flat soas to rest upon the upper flat surface of the tool-rest, the collarhaving sufficient diameter to extend acon-- siderable distance on eachside of the slot or channel of the tool-rest. The upper surface of thiscollar forms a globularl segment. 7 is another collar, also centrallyperforated to fit over the Atool-post, and its lower surface forms aconcave globular segment of the same radius with the upper surface ofthe collar 6 so that the two lit upon each other. The hole through thecollar 7 is only su'lliciently large to allow the tool-post to slidefreely through it, but the hole through collar 6 is large enough toallow the tool-post to be tilted to one side or the other, and thecollar 7 slides with it over the globular surface of 6 thus it will beseen that the tool-post may be tilted to any desired angle with relationto the tool-rest; the connections heretofore described forming auniversal joint for such movements. 'lhe tool-post is slotted in theusual manner, as shown at S to allow the tool 9 to be passed through it,and the tool is locked in position by a set screw l0 passing through thetop of the tool-post =l in the usual manner, and as here shown.

By this construction it will be seen that as the upper collar 7 moves inunison with the tool-post, the latter will always project at rightangles with the upper surface of this collar whatever may be the angleof thepost with relation to the stationary support. The holdingscrewconsequently bears squarely upon the top of a rectangular tool, and thelower surface of the tool in like manner bears squarely upon the top ofthe collar 7, thus insuring a iirni locking of the tool in position.

It will be seen by this construction that if it is desired to raise orlower the cutting point of the tool, it may be effected by loosening theset screw, moving the upper collar 7 over the globular surface of thecollar 6 until the desired angle is attained, when the parts may beagain locked together by means of the screw, and the angle of the two isthus obtained without any blocking up by independent pieces as isusually done in the ordinary construction of tool-posts.

If it is desirable to change the clearance of the tool in relation tothe work upon which itis engaged, or as is necesssary in cutting screwsof coarse pitch, the toolpost may be turned a little to one side or theother, the adjustment always being made between the globular contactsurface of the collar 6 and 7, and by means of the similar contactsurfaces between the head 5 of the tool-post, and the lower surface ofthe slide or collar 2; these adjustments are all compensated in thecontact between these two latter parts. Thus when the parts are lockedtogether, there is always a l'lat surface of contact, and a perfect andsteady lock of the parts.

I-Iaving thus described my invention, what I claim and desire to secureby Letters Patent is-` The combination with a slidable and channeledtool-rest, of 'a rectangular slide adjustable in the channel and havingan opening and enlarged concavity below, a single piece tool-post havingan enlarged convex head at IOO IIO

FEU l -f the loWer end fitting the lower part of the clamping Screw tolook all movable parts toto slide, a collar having a flat surface ofSupport gether. upon the rest, and above the bottom of the In testimonywhereof I have hereunto set post, a globular oonveXty above and a eenmyhand in presence of tWo subscribing Wittral opening of larger diameterthan the toolnesses.

post, a second concave collar fitting and sld- JOHN W. SWIFT. able uponthe surface of the first named Col- Witnesses:

lar, a tool passing through a slot n the post S. H. NOURSE,

and resting upon the upper collar, and a l D. B. RICHARDS.

